WHILE MAKING THE REQUIRED WEEKLY EXAM, THE FIRBOSS DISCOVERED A ROOF FALL IN THE RETURN AIR COURES, #1 ENTRY, 1 BK OUTBY SPAD #313. THE FALL WAS BETWEEN THE BLOCK IN THE ENTRY TO WAS APPROX. 3 0 FT LONG X 17 FT WIDE X 4 1/2FT THICK NO EQUIPMENT WERE INVOLVED.